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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9ec3131e8fa25ce1e55d8f920f67eb751114dfff5d7a6464ec1b60b2df8358' 
  AND token = 'aGaEpXPQmvuv9lqZAH6+8SAA4APU3D/Eyc6mkFu8vF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}